Page 36 - Fluid Power Engineering

Intr oduction to Hydraulic Power Systems 13

9. Redraw the circuit of problem 8 in lifting mode. For the same pump flow
rate, safety valve setting, and dimensions, calculate the maximum load that
the system can lift. Calculate all of the system operating parameters at this
mode. Neglect the hydraulic losses in the system elements, except for the
throttle valve.

1.7 Nomenclature
A = Piston area, m 2
p
E = Gained potential energy, J
F = Vertically applied force, N
g = Coefficient of gravitational force, m/s 2
m = Mass of lifted body, kg
N = Mechanical power delivered to the load, W
p = Pressure, Pa
3
Q = Flow rate, m /s
v = Lifting speed, m/s
V = Piston swept volume, m 3
W = Work, J
y = Vertical displacement, m